SUBSTANCES BY THE BLOW-PIPE. 221 



b. Fe — Iflas — Co— &C., remain iu the bead, p. 115. 



If the bead spreads out on the Ch, it must be collected to a globule by continued blowing;. 

 Make a borax bead on platinum wire, and dissolve in it some of the fragments of the bead, reserving 

 the rest for accidents. 



c. Wi — Cms— Ag" — Abj— Sdb — PE) — Kn ave reduced and collected by the lead but- 

 ton. Su, Pb, Bi, if present, will be partly volatilized, p. 115. 



Eemove the lead button from the bead while hot, or by breaking the latter, when cold, on the anvil 

 between papei', carefully preserving all the fragments. 



(1. If C© is present, the bead will be blue. 



If a largo amount of We is present, add a little borax to prove the presence or absence of Co, p. 



If 3Iu is i>rcseut, the bead, when treated on platinum wire iu the O. F., will become dark violet or 

 black. 



e. If only Fe and Mu with no Co are j)resent, the bead will be almost colorless. 



Look here I'or Cr, Ti, Mo, U, W, V, Ta by the wet way. 



A cousideiable amount of Ti may be detected with S. Ph, and tiu in the original oxides, in absence of 

 other non-reducible coloring oxides, p. 323. Mo will be shown by the cloudy brown or black appear- 

 ance of the boiax bead in the E. F. on platinum wire, p. 105. 



/. Treat the button c on Ch, iu the O. F. until all the lead, &c. is driven off; Ma, 

 Csa, Ag, Abb remaining behind ; or separate the lead with boracic acid, p. 442. 



(/. Treat the residue g on Ch, iu O. F. with S. Ph bead, removing the button while 

 the bead is hot. 



h. If Wi and Cai are present, the bead will be green when cold, p. 292. If Nj 

 only, yellow. If Cea only, bine. 



Prove Cbb by treating with tin on Ch in the E. F., p. 293. 



i. For Ag" and Abb make the special test No. H. 



B. Treatment of the second portion.— Drive off the volatile substauces in the 

 O. F. on Ch. Treat with the R. F., or mix with soda, and then treat with the R. F., 

 for S sill, Cd, §Ba. If a white coating is formed, test with cobalt solution, pj). 251, 

 256, 270. Note, p. XV. 



C. Treatment of the third portion. — Dissolve some of the substance in S. Ph 

 on platinum wire in O. F., observing whether Si O- is present or not, and test for Maa 

 with nitrate of potassa, p. 210. 



3. Test for As with soda on Ch, iu the K. F., or with ^ry soda in a closed tube, p. 

 345 ef seq. 



4. Dissolve in S. Ph on platinum wire in the 0. F., (if the substance is not metallic 

 and does not contain any §.,) and test for §fe on Ch with tiu in the 11. F., p. 99. To 

 detect small amounts of Sb with Cu or Sn, see p, 331. 



5. Test for Se on Ch, p. 368. 



6. In absence of Se fuse with soda iu the R. F., and test for IS on silver foil, p. 365. 

 In presence of §e, test for S in open tube, p. 366. To distinguish between S and 

 SO^, see p. 3GB. 



7. Test for Hg with dnj soda in a closed tube, p. 304. 



S. Mix some of the substance with assay lead and borax glass, and fuse on Ch in 

 the R. F., p. 401. Cupel the lead button for Ag., p. 407. Test with nitric acid for 

 Abb, p. 320. 



9. Test for CI, Br, and B with a bead of S. Ph saturated with oxide of copper, pp. 

 373, 374, 375. 



10. Test for CI or Bl' with bisulphate of potassa, p. 374. 



11. Test for HO in a closed tube, p. 353. 



12. Test on platinum wire, or in platinum pointed forceps, for coloration of the 

 flame, p. 72 et seq. 



13. Test for CO- with hydrochloric acid, p. 360. 



14. Test for NO"^ with bisulphate of potassa, p. 354. 



15. Test for Te in an open tube, p. 351. 



